extern bool maskcheck(const void *mask, size_t masklen, size_t len);
extern bool net2str(char *netstr, size_t len, const subnet_t *subnet);
extern bool str2net(subnet_t *subnet, const char *netstr);
extern bool maskcheck(const void *mask, size_t masklen, size_t len);
extern bool net2str(char *netstr, size_t len, const subnet_t *subnet);
extern bool str2net(subnet_t *subnet, const char *netstr);